thriftbooks.com

Does it have to be a website? Local libraries usually get far more donations of paperbacks than they can handle and will essentially give you as many as you will take. They usually have a room somewhere to buy them for $.10 or so if they aren't willing to just hand them over for free.

Well, I said website 'cause I'm in France and in my village there's no library soooo

Go to freeebooks.net they have books there that are good but I live in america so I don't known if it works every where else.

My bad the Link is actually http://free-ebooks.net/

Hope this helps

Try using your local version of CraigsList. People often put book lots for sale because they're moving or cleaning out clutter.